hey guys

I really admire ur work in this forum it is really a great deal.
I need ur help!!!!!!!!
I have a Cisco 1711 router with IOS image 12.3.
I have a simple networking scenario. What I wanna is that if any user on the networks initiate an http request the router asks the user to authenticate himself. I want this to be done without any server connected to the router.
Thank u.